Also, the earlier recommendation of EscapePod shouldn't be discounted because it is audio format. Many of their stories are "reprints" and they always link the source when there's a web presence. Often, you'll find either a download or an online version at the original source. I found both Lightspeed Magazine and Clarkesworld Magazine that way.

EscapePod, along with its sister podcasts PseudoPod and PodCastle, have excellent editors. Anything they choose to present is well worth either listening to or reading.

I like getting my science fiction short story fix from Escape Pod. It's a podcast, not electronic text, but most of the stories are pretty good, and it is free. Most of the stories are about half an hour long.http://escapepod.org/

I LOVE Escape Pod, and the other two iterations as well -- Podcastle and Pseudopod.

Have you ever listened to Starship Sofa? It's a great sci-fi audio fanzine -- it usually has a couple short stories and some other 'industry' type 'articles'. It's worth the listen, in my opinion.

Since we are on to short fiction, I'll dump some of my bookmarks here for anyone who wants to read or listen to more. THe ones already posted are great too, some of these below I've not had time to read yet:

The best SF anthology ever was The Science Fiction Hall of Fame, Volume One edited by Robert Silverberg and published in 1970. It's not available as an ebook. (The Science Fiction Hall of Fame by Robert Silverberg at Fictionwise is apparently a short story).

These are all stories that pre-dated the Nebula Awards and were chosen by the SFWA.

The best SF anthology ever was The Science Fiction Hall of Fame, Volume One edited by Robert Silverberg and published in 1970. It's not available as an ebook. (The Science Fiction Hall of Fame by Robert Silverberg at Fictionwise is apparently a short story).

These are all stories that pre-dated the Nebula Awards and were chosen by the SFWA.